Keyboard Malfunction Quick Fix Help

I own a Macbook Pro v3.1 (released circa 2007)* and it's a hand-me-down from my dad but it still works perfectly fine. I've had the battery changed just once so far after the original battery died a natural death (about 6 months ago). Also, I had the logic board replaced about the same time I got a new battery (factory defect with the video card; was replaced free of charge c/o Apple), but other than that, I've never had a problem with it until now.

My right arrow key started malfunctioning last week, and now it's completely stopped working. Is there any quick fixes for this? Or does anyone know how I can fix this without having to go to an Apple center? I just can't live without my arrow keys! Thank you!